I thought I was photographing a chirping male cricket. I realized there was another cricket (female) when I post processed the images on my laptop! I think the male was playing a courting song and the female was on top of the male. Night find, Selangor, Malaysia.
Info from Nancy Oecanthinancy: The male raises his wings to sing and to expose the metanotal gland. The female sips from the gland to get her in position for the male to transfer a spermatophore. He then keeps the gland exposed so she will continue to sip from it - and thus prevent her from removing the spermatophore too early.